3A2 Chapters 7-10 Practice Questions
Final Exam with Correct Answers
Graded A+ 2026 Updated.
The separately excited generator has a _____ load characteristic:
a. Parallel.
b. Rising.
c. Level.
d. Falling.
e. Series - Answer c. Level.
Armature reaction _____ the main field of a generator.
a. Restores.
b. Reverses.
c. Increases.
d. Decreases.
e. Distorts. - Answer e. Distorts.
The armature core in a DC machine is made of:
a. Stainless steel laminations.
b. Copper laminations.
c. Copper.
d. Soft iron laminations.
e. Hard steel laminations. - Answer d. Soft iron laminations.
In a DC machine, interpoles carry _____ current.
a. Armature.
b. Field.
c. Load.
d. Flux.
,e. Stator. - Answer a. Armature.
DC motors are restricted to a starting current of about _____ percent of full load current.
a. 50
b. 250
c. 150
d. 200
e. 100 - Answer c. 150
The shunt generator has a no-load characteristic similar to that of the _____ generator.
a. Internally-excited.
b. Parallel.
c. Compound.
d. Series.
e. Separately-excited. - Answer e. Separately-excited.
In a generator, the direction of the induced emf can be determined by applying Fleming's _____
Hand Rule.
a. Left
b. Two
c. Back
d. Right
e. Inverse - Answer d. Right
The yoke in a DC machine is usually made of:
a. Aluminum.
b. Semi-conducting materials.
c. Steel.
d. Copper.
e. Insulation. - Answer c. Steel.
,As the flux of a shunt motor remains constant its torque is:
a. Inversely proportional to armature current.
b. Increased.
c. Decreased.
d. Unchanged.
e. Proportional to armature current. - Answer e. Proportional to armature current.
Where high starting torques are required but the running load may be small the DC motor to
use would be:
a. Series
b. Under compounded
c. Over compounded
d. Compound
e. Shunt - Answer d. Compound
The voltage drop at the armature of a shunt DC motor is a percentage that normally does not
exceed:
a. 0.05 %
b. 0.5 %
c. 5.0 %
d. 50 %
e. 0.9 % - Answer c. 5.0 %
An electrical source could be in the form of a:
1. Battery.
2. Magnet.
3. Flux.
4. Generator.
a. 2, 3
b. 1, 2, 4
c. 2, 3, 4
, d. 1, 2, 3, 4
e. 1, 4 - Answer e. 1, 4
In a shunt motor, if the field becomes disconnected during operation the motor will:
a. Not change.
b. Slow down.
c. Over speed.
d. Stop.
e. Under speed. - Answer c. Over speed.
The practical unit used to represent electrical load is:
a. Ohm.
b. Farad.
c. Henry.
d. Amp.
e. Impedance. - Answer a. Ohm.
The end shields of a DC generator hold the:
a. Rotor and the armature together.
b. Armature conductors at the ends of the armature.
c. Field windings tightly to the field poles.
d. Bearing housings.
e. Brushes in contact with the armature. - Answer d. Bearing housings.
Since the flux of a shunt motor remains constant, its torque is:
a. Unchanged.
b. Decreased.
c. Inversely proportional to armature current.
d. Proportional to armature current.
e. Increased. - Answer d. Proportional to armature current.
Final Exam with Correct Answers
Graded A+ 2026 Updated.
The separately excited generator has a _____ load characteristic:
a. Parallel.
b. Rising.
c. Level.
d. Falling.
e. Series - Answer c. Level.
Armature reaction _____ the main field of a generator.
a. Restores.
b. Reverses.
c. Increases.
d. Decreases.
e. Distorts. - Answer e. Distorts.
The armature core in a DC machine is made of:
a. Stainless steel laminations.
b. Copper laminations.
c. Copper.
d. Soft iron laminations.
e. Hard steel laminations. - Answer d. Soft iron laminations.
In a DC machine, interpoles carry _____ current.
a. Armature.
b. Field.
c. Load.
d. Flux.
,e. Stator. - Answer a. Armature.
DC motors are restricted to a starting current of about _____ percent of full load current.
a. 50
b. 250
c. 150
d. 200
e. 100 - Answer c. 150
The shunt generator has a no-load characteristic similar to that of the _____ generator.
a. Internally-excited.
b. Parallel.
c. Compound.
d. Series.
e. Separately-excited. - Answer e. Separately-excited.
In a generator, the direction of the induced emf can be determined by applying Fleming's _____
Hand Rule.
a. Left
b. Two
c. Back
d. Right
e. Inverse - Answer d. Right
The yoke in a DC machine is usually made of:
a. Aluminum.
b. Semi-conducting materials.
c. Steel.
d. Copper.
e. Insulation. - Answer c. Steel.
,As the flux of a shunt motor remains constant its torque is:
a. Inversely proportional to armature current.
b. Increased.
c. Decreased.
d. Unchanged.
e. Proportional to armature current. - Answer e. Proportional to armature current.
Where high starting torques are required but the running load may be small the DC motor to
use would be:
a. Series
b. Under compounded
c. Over compounded
d. Compound
e. Shunt - Answer d. Compound
The voltage drop at the armature of a shunt DC motor is a percentage that normally does not
exceed:
a. 0.05 %
b. 0.5 %
c. 5.0 %
d. 50 %
e. 0.9 % - Answer c. 5.0 %
An electrical source could be in the form of a:
1. Battery.
2. Magnet.
3. Flux.
4. Generator.
a. 2, 3
b. 1, 2, 4
c. 2, 3, 4
, d. 1, 2, 3, 4
e. 1, 4 - Answer e. 1, 4
In a shunt motor, if the field becomes disconnected during operation the motor will:
a. Not change.
b. Slow down.
c. Over speed.
d. Stop.
e. Under speed. - Answer c. Over speed.
The practical unit used to represent electrical load is:
a. Ohm.
b. Farad.
c. Henry.
d. Amp.
e. Impedance. - Answer a. Ohm.
The end shields of a DC generator hold the:
a. Rotor and the armature together.
b. Armature conductors at the ends of the armature.
c. Field windings tightly to the field poles.
d. Bearing housings.
e. Brushes in contact with the armature. - Answer d. Bearing housings.
Since the flux of a shunt motor remains constant, its torque is:
a. Unchanged.
b. Decreased.
c. Inversely proportional to armature current.
d. Proportional to armature current.
e. Increased. - Answer d. Proportional to armature current.
